I like this! It's cute. I know it's not finished, but at least considering its state right now (A menu that simply says "play" and an incomplex wave survival with 17 enemies), getting your desired build can be difficult. I feel like maybe for each 5th round, a 4th card is offered so that you're more likely to get the option you'd like.
In my case specifically, I am trying very hard to get an orbital build going, but the game doesn't wanna offer it up. That + the fact that bullet speed is worthless to most other builds means I'm under-powered and gambling on my survival until I can get an orbital card or I'm sacrificing cards to empower less important parts of my kit.
The nature of the upgrade system working through random cards tells me chance is part of the experience, but it can be annoying to have your playthrough dictated by the deck. It can be hard to add anything with how ability specific cards can clog up your options (STOP OFFERING ME BLOOD MAGE CARDS, I'M HOLDING UP FINE THANK YOU)