Why does this game have such good user review scores?

Spooky Cat is a somewhat bad 2D platformer with admittedly cute, but crude, graphics and floaty controls. There's very little to it actually, jump around, collect coins, try to deal with the somewhat wonky hitboxes and try to not get too bored. This game is not offensively bad though, it works, it's just does the bare minimum. Had this been released for free by someone who's learning to make games and who wanted to show off their first proper project, I would even say it's pretty good, all things considered, but it should not be a paid product. This feels like what you would get if someone spent a week learning a new set of game making tools.

Crowtel Renovations is a simple 2D platformer, but unlike Spooky Cat some care and attention has gone into making it.

You're playing a crow who's hotel is going to be inspected by the Health Inspector Cats, and things are really not so good in it. Heck, they're still constructing some of the floors! So you need to get through the hotel and clean things up. This pretty much just means that you need to get through some pretty typical platforming challenges, and defeat some bosses. The cute graphics and general charm of the game really helps what's otherwise a good but not exceptional platformer stand out a bit.
If you decide to play this, don't forget that there's a second campaign after you beat the first. Each campaign is about 20min long, so it's a very short game, but it's at least fun.

Finally, a Piranha Bytes game that's good!

Piranha Bytes is a company with a rather spotty track record. They made Gothic 1 & 2, which were great, then 3 which was mediocre, than Risen 1 which was good, and then Risen 2 & 3 which I did not enjoy. And now there's ELEX.

ELEX feels like an attempt to make something a bit akin to their older (better) games, but with a more open world. And they mostly succeed. As is typical to Piranha Bytes ELEX is a pretty punishing game, if you're not careful with what fights you take early on you'll likely die.
As is typical for Piranha Byte games you're dumped into a world that has 3 different factions vying for power. All three are flawed in some way and there's no one good side,

ELEX has a few rough edges, it's not entirely bug free and if you're not used to the Piranha byte style of open world design it might get a bit frustrating. But if you can look past those flaws, then this is actually a really good game. Is it their best game? Possibly not, but it's good and fans of open world RPGs should check this one out.
(Also, ELEX might well have the best rain effects I've seen in a game to date)