Thanks! Checking this out too.

... but its collider ignores walls, so it can shoot over walls. Would that be nice?

And another question about the above gif: The turrets shoot when the player gets nearby, which is fine. They hit walls all the time, which is also fine, but maybe it's also cool to have some sort of catapult type enemy, which shoots slower than the turret and at a lower distance

In playtesting matters probably yes, but I get to decide when the computer is turned off and when there will be candy!

Haha sure. It's also interesting that my playtester has no experience with the arrow keys. Funny we take things like arrow keys and mouse pointers for granted. He does not.