Really cool concept and aesthetic! Others have mentioned this already but the enemy AI is wayyy too accurate, can barely get a shot in edgewise before getting killed.
I dunno why this bugs me but the scale of the cabinets is too skinny, and I know the dial-up sfx are probably a nostalgia blast for some people but all I can think is why on Earth would an arcade game make a modem noise-
Those last 2 are just imho of course :D