So I played your game till the second boss.
The look is nice. I especially like the arcade machine effect, although the player projectile could stand out better from the background. At higher firing rates the screen shake becomes a little annoying.
You generate the stages randomly, which is very nice, but I think the only difference between the stages is the number and power of the enemys, am I right?
The challenge within the normal rooms becopmes negligible when the firing rate is upgraded to its maximum. Standing in the corner with triple shots and killing the approaching enemys is the way to go. More variety in enemy design would be nice.
The money rooms are kind of boring and give way too much money. I would suggest dropping a chest once a room is cleared.
The Boss rooms remain challenging enough thanks to the malfunctioning mechanics.
Please don't take my overly harsh criticism too hard. I had fun playing.