All around super awesome game, loved the presentation of the concept and the theme. I didn't really have trouble adjusting to the controls, maybe could have been ASD instead, but considering it's a game jam game and the only actions are shoot, switch, and move, i think the approachability was not all that bad.
I think one opinion that I had is that the switching, in the phases were the boss was outside of the arcade screens (which was most of the time), actually gave more of a risk to the player than not switching at all. The theme of confinement was really sold well, but it sort of ended up being a double-edged sword, since there was actually no feedback outside of each individual arcade cabinet to the overall game state, except when the boss would enter the cabinets. I would get caught in a tough spot or in a situation where damage was unavoidable, and although my first instinct would be to switch to a "safer" cabinet, I'd immediately take damage upon switching because I couldn't split up my attention between the active cabinet and the two non-active ones, so I just ended up staying on one cabinet for most of the duration I played the game. It seems like a hard problem to tackle especially because of the novelty of the format of the triple-cabinet mechanic, and I definitely don't want the novelty of the format to be sacrificed, because I really feel like there's something cool to be explored here and honestly think it's a really cool concept.
On the other hand, when the boss was inside one of the three cabinets, I thought it was pretty interesting how you could swap out to avoid attacks, and then swap back in, and definitely gave the nice feeling of dodging things and being slippery, the basic feel-good-ness that bullet hell games generally give.
Definitely a stand-out game among the other submissions, awesome work and bullet/attack patterns made in such a short time. I feel like it's the kind of game that has a looot of room for iterations, alternate mechanics, pivot points in development, etc. that would improve the game simply because the base concept is so cool. Enjoyed playing it a lot, congrats on the submission!