Thanks for the feedback! Glad you liked it =)
I have some ideas on how to fix the problem you mentioned with pieces not rotating if you move a mouse a bit, will try to add it in the post-jam update!
About the screen turning red, I think it happens when you click outside the game window and then drag the cursor in, so the window becomes 'selected'. My friend had this glitch too, but I'm not sure how to prevent this from happening... 🤔