Gravity Circuit - 312 MB
This game deserved a little special attention, being a Mega-Man (maybe more zero-ish with a short knife?) meets Bionic Commando Mash-Together that actually came out really good with fluid controls, the ability to grapple walls and enemy projectiles, slide dash, and special weapons of course, while needing to swing over large gaps with the grapple (you can also hold some enemy corpses until you want to throw them lol), the story and graphics are nothing to write home about...but they got the gameplay aspect working together incredibly and it was included in HC recently.
I've mentioned some Megaman clones/wannabe games before but this is by far the best of the bunch and all I played was the first level of it. If it wasnt for persona and court coming up I likely would have continued playing tbh
At 312 MB I can't see it being extremely long, but with the simple graphics (old MM stylish with less color), it could be.
All I can say to fans of those games is definitely do not pass this one by...you'll regret it