To start off this game is a 2D roguelite Mega Man/Zero like platformer with randomized stages (nothing too amazing) and upgrades in the form of stats, pieces of equipment and relics. The game starts you on a random stage and you must play it to completion. In stages are boxes/chests which contain power ups/relics and bolts, which are money. You want to rush through the stage as every stage has a speed bonus which gives power ups, relics and bolts. At the end of the stage you fight the boss and like Mega Man they have weakness to one of your attacks. After you kill them you get power ups, a relic and bolts. Then you go to the next screen and you can get their power, bolts or a relic. Some attacks are not as useful to me, and sometimes you get nice relics or need bolts as well. Afterwards you choose 1 of 3 enemies and go and do their stage and go on until they're all done or you die. If you make it you have 2 more stages that are tough and have tough bosses at the end.
As you go on the bosses you choose near the end of the playthrough have stronger attacks and more life. You may want to choose harder bosses first, or wait till you have a weakness weapon for a boss. The game also has challenge rooms in stages in a red helmet door, and if you pass them you get equipment with very strong passive or active abilities. It is random, so it's best to do these unless you have very little health.
The music and sounds are quite good. They sound like a proper Mega Man game being the music is chiptune. The graphics are not as good and look almost flash game like especially for the character models. Honestly it doesn't bother me, but you can tell it's an indie game. Everything animates okay, which is likely what's most important. I also have to mention that you really need a controller. It recommends the Xbox One controller, and I recommend the Series X one myself. I wouldn't play this game with keyboard controls only. It's way too twitchy.
While the game totes itself as an infinitely replayable Mega Man/Zero type game, you will get bored. The random generation of levels kind of doesn't excite as much and generally gives similar levels on replays. They always have something like maybe certain enemies or obstacles like teleporters in one of the stages. I also don't feel the gameplay is super engaging, but it's still a very decent game. The last 2 levels are overall CHEAP as they throw so many obstacles and enemies just to drain your life. It's meant for you to die there often I'm guessing, which Is why I recommend attack and health for the stats. You also have power damage (the attacks from bosses), but these drain fast enough that it's likely better to use them only when you need it. You also can charge your main weapon, but it's generally better to tap as fast as you can. The items themselves you collect are a bit boring, but it's not terrible. At least everything is easy to understand. Overall I give this is an average grade of 6.5/10. It wont amaze you for long, but is always worth it bundled. I've heard 30XX is very similar except with better gameplay, better co-op, better graphics and just more to do. I may hold off on it because I got my feel of that genre with this game, but overall I'd probably recommend getting the newer game.