Thanks for the detailed feedback! I'll look into the shooting side because I agree it feels off. I probably should work out a system to have it collide with walls differently so that it doesn't destroy immediately on impact. Probably shrinking the bullet size would help a bit too.
I suppose for the controls I could include an icon in the top corner of each one to remind people how to activate them. I can definitely see how showing both control schemes can make it a lot more confusing. Adding more friction to the movement might help with the slidey-feel too so I'll have to take a look at that.