I really, really want to love this game. It has such great ideas and I love the concept for it. However, there are a few major things holding it back:
The enemies which spawn in the middle of the room can immediately attack you resulting in incredibly hard to avoid damage.
Attacking is quite inconsistent. Pressing the attack button sends your positive emotions at where your aiming but only so far from wherever they are. It's likely they won't reach where you're aiming and might be too far to really help.
Are enemies supposed to deal two damage? It's difficult to tell since you start with 5 health and get drops for single hearts.
Sometime, I can kind of get caught on walls if I walk into them just right.
These are all very solvable issues and I would love to see this game expanded on. There should be more mechanics to encourage fluctuating between using many and few positive emotions at once. Additionally, I'd love to see the different emotions do different things.
This is just such a great base to work off of and I love the idea. I hope you'll be able to continue the project.