I had anticipated for this game for quite some time considering promising reviews and when i finally got it became clear that it wasn't worth it.
At first glance its fine game, metroidvania, loot, decent fights and progression feels nice and fun. Closer to middle of game you cant help but start to notice more and more of "paper-cuts" scattered all around. Backtracking is excessive, money is scarce, weapons variety isn't that big as it seems at first glance - you either use slow-but-strong or fast-but-weak one, good that your inventory isn't limiting you so you can carry both and switch if needed.
Room design is another thing - procedural level creation is interesting, but when you see same-design room in row its getting annoying.
Even worse thing is that game not so good at following metroidvania rules. Generally when you get new upgrade a lot of new areas gets accessible to you leading to new secrets and loot, but not in Chasm - some upgrades is either almost useless (basically no place to us them) or completely optional and can be skipped completely
Story is quite nice at start, but unable to keep any meaningful suspense for long enough - from middle of game its became obvious that is it all about, who is bad guy and who probably will be final boss.
Graphically game is totally fine for pixel art lovers and pleasant to look at, but lacking in eye candy (however, old castle parallax scrolling background looks superb) area.
In term of environment Chasm doesn't invent anything new either - cave\mines, jungle\garden, castle...crypts is disturbingly macabre however, its impressive.
Overall Chasm feels like a good attempt which is falls apart, unfortunately. Maybe its too much reliance on procedural generation or just lack of soul, but i didn't found Chasm memorable enough to love.
So, should you buy it? Maybe, but be prepared - chasms isn't place where only good things live.