Game's great but the boss is dissapointingly easy. Took me ages to get to him but had no problems at all defeating him full health. Might want to change that. I love the way the mobs change the higher you go. Just make a final boss so hard that one needs more of the items from the shop to even think of beating it and it will be perfect!
Got to 8th level and got bored. Good graphics, music gets a little annoying after a while. You should consider adding 'time trial' mode. 4/5 as for now.
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I'm working on the new version. Longer, less buggy, more polished.