As someone who plays embarrassing amounts of Tetris, this was actually pretty fun.
It looks like the enemies take 100 damage for each row cleared. I would recommend adding a slight multiplier to this. So for example, if you clear 1 row, they take 100 damage, but if you clear 2, they take 250, 3 and 400, etc. As it is now, there's not really any reason to try to clear more than 1 row at a time.
It would be nice if you could move through the dungeon via arrow keys instead of the mouse. And if you DO use the mouse, allow me to immediately move to rooms I've already discovered by clicking directly on them, instead of having to click into each room until I get there.
Entering cursed rooms doesn't seem to do anything? It says "Received a curse but gained an item", but I don't see anything different. Same with the Blessings.
One enemy said "Only takes damage when X rows are cleared", but it doesn't look like it told me what that number X was. It must've been at least 3, because clearing 2 rows didn't do anything.
Maybe limit the number of Merchants that can appear at one time. One of the floors I was on had 5 merchants on it.
Q and W to use items felt a bit awkward to me. This might just be because I'm used to using the arrow keys for movement and C for hold.
