Test test.
This game does exactly what it sets out to do. The way the spells work means that you have to create a well-balanced loadout and anticipate what's going to happen in the next room.
The stats are a little unbalanced (you'll see), as one is significantly weaker and one's extremely useful, but it's fine, since the spells themselves benefit from different stats.
All in all, it's a good way to kill an hour or so.