It's not in my library.
I don't know anything about Opera's GX browser, but that is totally irrelevant to the games herein. The bundle description above on the store page does a wonderful job of describing the games included. There are no performance problems of which I am aware, and each game is quite distinct and enjoyable in its gameplay mechanics. If you're a platformer or metroidvania kind of gamer, then this bundle should satisfy your gaming needs. The games are beautiful, the gameplay is fun, and the graphics are quite cute and charming. There's nothing here that will blow you away, so to speak, but it's well worth $20.
It's Dead Cells, but it's also Castlevania: Symphony of the Night...with official licensing...but still uniquely Dead Cells In other words, the franchises got together, made sweet sweet cuddle puddles, and this is the result: ONE EPIC ROGUETROIDVANIA. You're getting a hell of a lot (or is it lots of hell?) for $10! I won't comment on controls or graphics because you should already be familiar, but the music....... It's really quite impressive how they took those classic Castlevania tracks and rearranged them for this game, yet kept the feel of the originals. Not to mention, you can listen to 51 of the tracks in boop boop beep boop beepity boop boop beep 8-bit style.
