I've been playing Dead Cells ever since it was discounted on GOG not that long ago.
Finally managed to beat the secret boss (i.e. finish Hell mode, also known as "5 BSC"). The difficulty curve of the game is really weird. It starts out easy, stays that way until two boss stem cells, then becomes insanely hard, three and four stem cells is comparatively easy again and 5 BSC is... strange, because the only truly difficult part for me, apart from not paying attention and dying to something silly is the Hand of the King (final boss in 0 to 4 BSC).
The first run I've managed to get past 5 BSC HotK was the one I beat the game at - I'll freely admit that I've watched a bunch of people kill the final boss on YouTube before ever seeing him so I knew what was going on, but still, killing him first try was weird. I've seen people on Steam and Reddit post that they can defeat Hand of the King with no issues but struggle on The Giant or the final boss. For me that's entirely the other way around. Both The Giant and the final boss have very well telegraphed attacks that seldom overlap into ridiculous stun lock insta-gibs. HotK can do that, his attack patterns are way too random, they can sometimes get stuck and heaven forbid if you whack his transition phase too quickly and he fist charges you into leftover Disgusting Worm bombs. It's also really frustrating when he summons exploding banners, follows this up with his super-souped up Telluric Shock and then forces you to eat the banners by dashing around.
Anyway, fun game. Will probably play some more, there's this final, final ending left to see and all that. 140 hours so far out of a 10 € investment ain't half bad.