I'll reflect what Qwott said mostly:
-Movement isn't nearly precise enough and the camera is too close to avoid the kinds of things the game throws at you.
Additionally to this, I wonder if having back boosters could help add some complexity and allow the player some more freedom of movement
-the character floatings upwards on a balloon forever after you die forcing you to quit to the menu
Yeah, this was pretty annoying. You should be able to get right back into the main game loop with even just a single keyboard button so your hands don't have to leave the keyboard. A few seconds delay would keep people from accidentally starting a new session on accident as well.
Overall, pretty fun, though it was frustrating to keep on restarts have I had gotten so far since the difficulty didn't seem to reset