very nice game!
a little more checkpoints would have been nice, and some of the camera angles made things hard to understand (like the one spikeless pit of certain death near the end). but the game design was interesting bc you mixed 3D assets with 2D sprites. this can work, but i think the current 3D levels look really bland.
the jumppack mechanic was cool, but if you were to redo this game, i would let the player control when they did the jump pack, and maybe have it on a cooldown or only reset it once they land on a platform. having to wait for the timer isnt very fun.
overall well done and i think theres potential for a full game here