So I'm actually kind of on the verge of recommending and not recommending Melody's Escape. I'll explain, of course, but in the end I do recommend this - just to a certain crowd of gamers.
Now, I have previously reviewed Audiosurf, and after finishing everything I wanted to do in Melody's Escape I moved on to Beat Hazard. All three of these games are similar in the whole "play your own music" motif, but each game has vastly different gameplay mechanics. And I have to admit, out of these three "play your own music" games, Melody's Escape did the least for me. Don't get me wrong, it's not a terrible game, just not a fantastic one in my eyes.
In short, Melody's Escape is a running game set to your music. You control a female protagonist named Melody and tap certain directional keys to correspond with obstacles, such as sliding, jumping, and kicking through blocks. There are sections for each type of intensity, as well. The background changes to a slightly hotter color and the scenery moves faster as the intensity of a song builds up. On top of this, there are also slow-motion sections of long jumps for cooldown segments of songs, which I think is quite a nice touch despite being rare, as I've only encountered such sections maybe 3 or 4 times out of the hundred-ish songs I played. Finally, there are multiple difficulties you can choose from. The easiest has you press only one directional key for each section of a song, and the hardest has you use both
WASD and arrow controls for certain types of obstacles, which poses a substantial challenge.
However, besides the decent gameplay, this game has a few issues for me. First off, the visuals in this game are very basic and bland, and the game isn't nearly as visually appealing as Audiosurf or Beat Hazard. Even the menu looks rather boring. Unlike other rhythm games I've played, Melody's Escape features no music on the menu, and I think that's a nice facet that rhythm games ought to have. In Melody's Escape, the menu is just silence, save for the minimal "beep" sounds that you hear when selecting options on the menu.
There is also very little to do in this game and minimal incentives. There isn't a sort of leveling up system or anything to unlock, nor leaderboards for songs, rendering your high score on songs to not have much purpose. The only real incentive in this game is the 8 achievements, which are all relatively easy to get if you're going for them. It only took me around 8 hours to get them all. After that, it comes down to merely playing for fun. And I'm not a huge fan of games that are solely made to pass time unless there's actual incentives or things you can do afterwards.
Anyways, if you want more of a "for-fun" rhythm game customized to your music to pass the time with, Melody's Escape would be a good purchase for you. If you're into games with more of an incentive and contain more for you to do, consider Audiosurf or Beat Hazard instead. However, keep in mind this game is still in Early Access as I write this and is probably awaiting a few changes, so I can hope that some of its issues will get fixed in forthcoming updates.