Amid Evil.
+ use of colour
+ level design
+ sound design
+ quick saves included (not a game breaker, but nice to have)
+ interesting enemy design, and although not quite my cup of tea in some ways, I think they've still managed to pull it off well and do something a bit different
+ skyboxes (I find that these can often appear overlooked even in games with bigger budgets, but not here. They've done a great job with the attention to detail)
+ atmosphere
Can't really think of any negatives right now, but I may update later.
+ use of colour
+ level design
+ sound design
+ quick saves included (not a game breaker, but nice to have)
+ interesting enemy design, and although not quite my cup of tea in some ways, I think they've still managed to pull it off well and do something a bit different
+ skyboxes (I find that these can often appear overlooked even in games with bigger budgets, but not here. They've done a great job with the attention to detail)
+ atmosphere
Can't really think of any negatives right now, but I may update later.