Cool ! Liked it !
the Boss Fight Is really cool !
I played a lot of Survivor kind of game and... This one stand's out by using the arena for the Boss Fight the Patern are easy to understand and well telegraphed !
It's weird to me that you can Max out every Upgrade, It doesn't feel like an choice but a must have (perhaps it needs to have an incremental cost ?)
Buggs / Misleading UI:
- The In the Weapon Shop you can spend all your money by replacing your Right Minigun by another Right Minigun (seems to precise ? I did spend all my currency thinking it was increasing the level of my weapon ^^)

Like I said the Boss is really a great combat and I'd like to see it with traps all over the place !