Yoo , this is my feedback:

• Graphics is simple but not that bad , style matches through the game.
• Character moves too fast and no coyote jump
• character jump is too low and it's kind of difficult to jump on boss head
• Boss fight lags too much as falling blocks keep changing their position horizontally somehow
• Health is way too much for normal stages but that's not too bad
• The sounds are funny , lol
• It's good all levels are unlocked from the start
• Text of the main menu is too big kind of , maybe make it smaller 
• I like that you made the cover icon without ui and it's kind of goofy , at least you tried , but it's not very professional ( if you want to continue working on the game after the game jam)

and that's all , good job , work harder and you will be better.

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