Hey, thanks for the really great feedback!
We also wished there was a title screen :( We had some really great art and a cool little back story we were going to put into a small cutscene before you got to play but unfortunately we ran out of time! I'm really glad you felt that way about the movement, we wanted it to be a bit unmanagable in order to fit with the theme, but not so much that it wasn't fun to play.
Again, we wanted to put item descriptions in game but ran out of time (48 hours is hard!). The white square items are different powerups that changes the rules of the game quite significantly. We put descriptions of these on the main itch page for the game, but the jam submission page doesnt let you be anywhere near as detailed :(. I suck at playing this recklessly and my best results usually come from picking off enemies one by one and using the walls to slow down the movement haha. It's great to hear that you had fun playing in a different way! One of the powerups was 'Vampire - Become invincible. Health drains slowly over time. Kill enemies to reset the timer and keep yourself alive'. We put this in specifically for players that wanted to play like you!
Regarding the floor, when the room is created there is an invisible object that randomly walks around the blank room for a set time. We used a DS grid to record each tile this object had been to as "floor". We had 4/5 different speck patterns and then just assigned each "floor" tile one of these patterns at random. Hopefully that makes sense! If you'd like to learn more the basis for the code was Heartbeast's video on random level generation. Check it out on Youtube!
Thanks again for taking the time to play and rating :)