Really nice game! It was a ton of fun to play. A bit chaotic at first as these games tend to be but after learning the basic layouts and such, I was hooked - and the shop is such an amazing feature!
I tried about 7 times to reach the top level, but sadly, except for my first two tries (where I died because I sucked) I died in the same way all the rest of the times, and that was when I entered a new floor only to have 2-3 enemies spawn on me. After a few tries I eventually felt it was a bit unfair so I gave up. But wow do I wish that wasn't an issue, I really want to beat this game. I'll probably get back to it later. :)
Aside from that sad coincidence, this game is really really good! Nice work!