The thing that originally stopped me from trying VVVVVV was the fear, that it's going to be stupidly hard to the point of not being fun. It really isn't, and if that's the thing that stopped you from playing the game before - you can safely buy it, because it's forgiving enough to make the game non-frustrating, but challenging enough to make the game fun. The entire concept with using just the directional buttons and the "flip" button, which "flips" gravity is used in so many imaginative ways in this game, you'd sometimes forget that you're using just one action button. But that simplicity is what makes this game work and be so fun. With the difficulty levels being available for thos who want more challenge. Game also features an unforgivable soundtrack, which seems to be sadly missing from GOG release, but should absolutely be bought seperately, your ears will thank you for that.
Guacamelee! is a very good looking "metroidvania" game, with fun luchadore-culture-inspired setting and interesting combat and navigation mechanics. It is also, unfortunately, the game which doesn't know what to do with all that and tries to be best at everything, becoming a clunky annoying mess in the later parts of game. The game starts great with fun unique setting and amazes with very interesting wrestling-inspired combat moves, which are used not only to fight but also for navigation. And for the first several hours it works like that, sadly loosing most of it's own identity with unending references to other games and internet memes. Then it tries to become Super Meat Boy in navigation (forgetting that the beauty of "precision" platformers lies in simplistic but responsive controls). And then it decides to "add variety" to combat by making enemies have a special shield, that can be broken only by very specific special moves. And everything falls apart. Navigation becomes a huge pain in the arse, by using confusing number different buttons and combinations to succeed,. Fighting becomes a chore, especially since it never truly evolves past the moves you do in the beginning and makes enemies just last longer and hit harder. I'm sure, there are players, who wanted exactly this - unnecessarily complex precision platforming and (clunky) long wrestling combat in a metroidvania game. But even those people will need to play through half a different game to get to what they want.
