Super enjoyable. At least, once I managed to turn off the CRT filter — can't see anything with that on.
Very complete experience. Coherent, easy enough to understand, a pretty fun game loop, unlockables, a tutorial, an option to save… it's all there. Stellar job all around.
If I were to nitpick, I'd say I was kind of missing something like a mini map. The reason being the following: after every trip to base, I found myself cycling through 1-5, so that I could see in which direction the objectives spawned. This way, I could at least awkwardly guess at the optimal route. Having to do this every time I went to get a reload got kind of tedious after a while. For me, having some kind of mechanism to at least gauge the distance to each of the targets would've been appreciated.
But regardless, this is an outstanding game.