I just got to level 52 (after about 5 tries of getting stuck on levels 4 and 9) and I have a couple things to say:
1. HOLY COW did I enjoy playing this game!!!! It's super simple, and yet, incredibly fun to play!! Very well done to the developers and person/people behind this game! I loved playing, and look forward to future games and updates from you!!!
2. I would've loved to see what round/level I was on while playing the game. Even if it just said Lvl 3. in one of the top corners or near the bottom... by level 40, I could've sworn that I was at 100 😂.
3. I really enjoyed all of the powers/cards and I loved being able to select between adding health or refilling energy or shooting more... I thought that it gave a good amount of variation to the deck, and I enjoyed that. I would've loved to see more variation in the hordes of enemies. Maybe when you get past certain rounds, make some of the enemies slightly faster, or bigger/take more hits to kill, maybe some that take a different path to get to me so I have to do a better job aiming or some that are able to dodge bullets... I'm just throwing some ideas out there, maybe color code them so I can tell which ones are which? Still really enjoyed everything, but would love to see some more variation in enemies to make it slightly harder, because I definitely could have kept going at 52, but decided to stop.
4. Couldn't agree more with @Pustman. Would love to listen to some retro music or maybe even just some lofi... not sure if what vibe you're looking for in the game music-wise, but there were a couple times where it just felt weird sitting in silence (especially when using the freezes.)
5. Once again, I REALLY enjoyed playing this game!! Thank you very much for giving me something to do for the past hour or so! I had a lot of fun and I hope the feedback is helpful!
6. (For the gamers): Eventually, after getting stuck at level 4, 7, and 9, what got me to level 52 was choosing to heal, prioritizing cards with a cheaper cost, and having at least one freeze and recharge card on hand at all times... admittedly, having more than one freeze is OP and isn't as fun because you have to wait for the time to pass, but by round 45 or so, I was just able to keep my one freeze in the Q spot, and just spam the other three keys... that way, the enemies were still coming, but I could just mow them down...