I spent a bit of time with Crystal Crisis and Jupiter Hell last night. Both of them seemed pretty solid.
Crystal Crisis is kind of ugly looking and I really didn't enjoy the angled view of the playfield, but apart from that it seemed great. Splitting gems across the far sides of your screen is a cool addition to the formula, and the controls were snappy.
As for Jupiter Hell, the RNG nearly got me to refund it after my first run. The game managed to give me what must have been the most boring seed imaginable. I went down 4 or 5 floors and found no grenades, no armor, and no weapon mods and was worried I had just bought the most barren roguelike imaginable.
Fortunately, my second run was much more interesting. The game is very simple, but it has some great design that forces interesting decision making. Your inventory space is very limited, and it pushes you to make careful decisions about what to keep and leave behind. The reloading mechanic is also pretty neat (which is not something I expected to say about a game with major Doom influences). The shotgun needs to be reloaded after every shot, and the revolver can fire 6 times, but would then need 6 separate reloads to get it back to full. It hasn't had a huge effect on the game yet, but I can see larger/tougher enemies forcing some really careful gun/ammo management. Overall it seems pretty good.
There are too many games coming out in August.