I had a very similar experience to what SoboDev commented here, so long as the level curve is balanced around playing through at a fast pace then its fine for me. However a more non-linear design would probably enhance whats already provided here. Either way very cool demo!

Played this for a bit. I didn't really encounter any bugs or shortcomings. It looks good and plays well. Most of my criticism are personal tastes, like levels being too linear (at least until the first tower boss, I didn't continue after beating him) so there isn't really an element of exploration. I feel like the only correct way to play this is by just rushing through it while I personally enjoy slower paced more tactical games.