What upgrades?
Graphically the game is great.
The description said there were upgrades. There are five weapons, three of which you need to collect ammo to use, but there are no upgrades. I played the whole game waiting to find an upgrade screen. Instead I just won.
Also, there is not much real variety in enemies. They are pretty much just bigger or smaller. I just shot them, usually with the biggest gun I had ammo for. There wasn't much to dodging besides "don't stand still." Got hit a certain amount, but health pickups and three lives got me through.