The game's description claims it is not a Metroidvania, but it appears to have a Metroid-style map system. So is it a Metroidvania or not?

Everything is in the title ! If anyone has the maps with all the secret rooms and markers to get all powerups please share ! I've found some secret rooms, but guess there are more ! The secret room with another secret room in it was really lame !

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Spoilers for a future puzzle, but this just kinda confounded me. About halfway through The Heart, there's a puzzle involving two sun medallions. the first one is in a room with an invisible beetle, two white aliens and a green bruiser alien, along with an infinitely spawning pink alien on a ledge you can't jump to. The objective is to get to the switch where the pink alien is, however you can't jump high enough. Does anyone know what you're supposed to do in this area? I had to exploit a weird ...

I installed the game and tried to run it, got this error before the game would even load: "OpenGL display setup failed. Could not create GL context." Anyone else had this problem before or know how to fix it?