This is really cool I enjoy it a lot! I wishlisted it on Steam! Do you have a plan on what's going to be in the full version already?
I assume probably more characters with diffrent skills? I think an endless challenge mode would be fun! Idk if this is maybe already in your current version but I think a relict that expands your inventory +1 would be cool too.
This is just visual flair but maybe the deeper you get into the dungeon the backdrop changes a little? Floor 1 to 10 could maybe still have a little grass, moss and plant life, 11 to 20 could just be stone and rubble, 21 to 30 might have bones laying on the ground. Obviously it's not important but it would be a fun visual!