Freedom Planet on Steam: http://store.steampowered.com/app/248310

Difficulty: Normal (3/4)
Version: 1.21.5

Bosses in video:

[00:00] 1. Hunter Snake (Battle 1)
[00:19] 2. Hunter Snake (Battle 2)
[01:50] 3. Claw
[03:31] 4. Mantalith
[05:52] 5. Serpentine
[07:21] 6. Robopanther
[09:49] 7. Spade
[10:40] 8. Satellite
[11:01] 9. Grappler
[11:31] 10. Prince Dail (Battle 1)
[14:04] 11. Neera Li
[15:01] 12. Serpentine (Battle 2)
[17:37] 13. Syntax (Spider Mode)
[18:37] 14. Syntax (Squid Mode)
[20:15] 15. Holodragon
[23:32] 16. Syntax (Cancer Mode)
[24:11] 17. Absolution
[25:30] 18. Prince Dail (Battle 2)
[28:10] 19. Syntax (Morpher Mode)
[30:01] 20. Mutant Serpentine
[31:41] 21. Mutant Milla
[33:25] 22. Lord Brevon

[37:31] Ending

I should've finished this a long time ago. The final boss battle is really difficult, but the most annoying thing is that i had to replay the whole stage every time.