A decent platformer, and the upgrade system is nice.
However, it seems to me that the game actually starts out pretty hard, and then slowly becomes super easy as you apply upgrades. Normally, a game starts out easy and becomes more challenging as you become more skilled in it.
Once you have a few upgrades, beating Hard is trivial, and I guess the game just never ends?
The levels themselves also seem quite repetitive, unfortunately.
However, the platforming works, and the idea of risking playing a harder level to earn more currency is interesting.