Good game with an enjoyable game play loop. I don't know if I'm just bad but I didn't make much more progress with each upgrade. For some reason I couldn't hear any music. I would appreciate the option take the game off full screen.
It felt quite unintuitive to me that the whole of my player was effectively on the ground. I felt like I should be able to move with my head over a pit but my feet on the ground because in actuality my head is above my feet and directly above the ground.