Downwell is an addicting roguelite which focuses all about pattern recognition. The premise is you're falling down a well, trying to get to the bottom, all while defeating monsters along the way with your gunboots. A good variety of weapons and power ups which are extremely satisfying to pull off and execute. It's easy to pick up and get as far as you can, and extremely addictive. Best $2 for an indie I've spent. Can't wait to try Poinpy, the next game from the creator which came out relatively recently.