Heres a walkthrough to Karoshi. If anyone has any other hints, tips or walkthroughs please post them as well. Not that i need them.

LEVELS

0. Just jump onto the spikes.
1. Press the button, then push the left crate onto the button. Jump on the right box, and then onto the spikes.
2. Jump over the button, and then push the crate to the left, once it stops moving, stand on the button.
3. Jump over the button, and pussh the crate under the other one. Then step on the button, and walk right.
4. Stand on the button.
5. Stand on the yellow button, then drop down to the right. Push the crate just enough so you can get out, and then push it back all the way. Climb to the top and push the crate to the right, so it lands on the button. Then go to the first crate and push that right. Finally, climb back up to the top again, drop down and touch the electrified box.
6. Grab the gun, then jump left and shoot. The bullet needs to hit the crate. Drop down from the jump and you should beat the crate down so you can get under it. TAKES PRACTICE.
7. Jum up to where the plant is, take the gun, and shoot the triangle to your left. quickly drop down left and stand on the button. Once the bullet has gotten past, jump off and run to far right. You should be hit by the bullet.
8. Jump to top left corner, after grabbing gun, and then shoot right. Drop 2 steps and shoot again. Stand on the button and then jump to a shoot a bullet throught the gap. Get back on the button so the bullet can get past, and then stand in the middle of the step below.
9. Grab gun, stand on middle step and fire. Jump to top step and jump again before the crate hits the button.
10. Push the crate right into the next room, where you place it under the other crate. Shoot the green squares and walk left. You get the idea.
11. Jump to top left corner and then jump right. Walk along onto the spikes.
12. Press K.
13. Grab the gun, shoot at pink sqaure aand jump again so the bullet hits you.
14. Move right before the crate comes.
15. Move left before the crate comes.
16. Get on the platfrom above you, and jump left twice.
17. Jump up, avoiding the buttons, and push the crate onto one. Then jump off the edge.
18. Jump the gap and follow the invisible steps.
19. Push the crate onto the button, then go all the way left. Go right again, and be careful not to let the top guy get caught on some thing. Make him jump the gap and push the crate onto you.
20. Press the button and wait.
21. Move left.
22. Just wait.
23. Stand on the button and then jump off the box to the platfrom above, push the box off and leave it half over the circle crate. Jump back, and push the first crate as far as it will go. Then push the other crate left onto the first button. Simply jump onto the crates and push the next crate onto the button. From there, drop onto the spikes.
24. Push the crate onto the button and then push the next crate onto wehere the barrier was. Push the crate after that onto the button, and climb up. Jump over the barrier and shoot the block. Push the crate onto the button and drop down. Walk right and you should drop down. Jump up to the spikes.
25. Grab the wings and fly into the spikes, or go to the end and then fly into the spikes.

BOSS

Boss 1. Walk towards him.
Boss 2. Jump onto hidden square to the right, and then jump into him as he comes close.
Boss 3. Shoot right and get underneath him.
Boss 4. Move to the left.
Boss 5. Keep jumping to the right.

thanks for the walkthrough. i was really stuck on level 12

Dang it, you stole my idea...

There are 2 ways to complete level 23. The other way is much easier. I won't spoil the other way for now.
Also level 24 could be solved alternatively.

Both ways probably aren't on purpose.

Thx for the walktrough... i really needed it!

Ok. I've been racking my brain trying to figure out the "other" way of completing 23. I want to know if it's faster than the original way. Anyone?