I think I have to start by saying that the technical achievement is great. I love a homebrew engine and I did a 'sort-of' one last year, but it was just writing to a framebuffer on the CPU rather than a full rasterizer, so i'm finding this extremely impressive. I do wish that the view was pulled back a little bit, but aside from that, it's got some really incredible fundamentals to move forward with.
The art is obviously great, and despite coming from a few different places, all intregrates nicely together for a cohesive experience. As does the sound, UI and all that. Everything works together nicely.
For some reason there are dozens and dozens of card battlers in the jam this year, and your implementation of the is one of the best i've played across probably over a dozen with card systems. Sure there were some balancing issues, but i'd rather be able to cheese through a game in a reasonable time considering the amount to be played and rated.
On that note. I would say in the current position of the game, it's probably too long already for the content. I felt like I had seen almost everything after the second ship and by the time I killed the boss it was getting a little stale for me. This is almost certainly a symptom of it being a jam and not having the time to expand the systems / enemies etc for more variety, but in that case I would say there's no harm in a game being shorter and taking 20-30 minutes. I think my playthrough took just over an hour and that was without stopping to shop at all (perhaps I missed something really interesting there).
The movement controller felt great, and the 'choose your own journey' on the bridge was great, but I did wonder if it changed anything? As it seemed the ships all had broadly the same layout.
All in all this is really strong, from both a sytems, gameplay and technical standpoint, with strong art to back it up. My only critique would be the length, but I might be alone on that! Thank you.