Cool game idea. But I had a bit of problem understanding what to do, showing the controls would've helped and/or any kind of introduction, you're kind of thrown in there and challenged right away before knowing what to do. You art is pretty cool, but a bit inconsistent, you have multiple pixel size in the screen making it seems like they don't belong together, i'd avoid scaling any art and if you do, scale everything with the same scale so a single pixel is always the same size on screen. Also you made pretty since grass tiles but it's pretty clear where one tile ends and the other begin, you might want to blur that line, look up for tileset tutorials. One last thing, losing makes you character stuck in place with a really small semi transparent window telling you you lost. I would make that window way bigger and clearer, since it seems like the bug bugged on me, since the window was so small and subtle.
Cool idea and nice art. Keep up the good work !