Enemies such as Goombas, Koopa Troopas and Hammer Bros. will block the player's attempt to make it successfully through the level.
The 3.0 update added additional character skins, special rendering modes to mimic other earlier computer gaming hardware, and levels inspired by the limited-release Super Mario Bros.
[11] While Super Mario Bros.: The Lost Levels received more votes, Jay Pavlina showed more interest in Special, which was slated for inclusion in version 3.0.
A WebGL port of the game was planned under version 4.0 with an experimental preview, but it was ultimately canceled due to getting a demanding job.
[14][15] In June 2012, Exploding Rabbit started a Kickstarter campaign to raise money for Super Retro Squad, a game inspired by Crossover.
As all the elements in Crossover are copyrighted, lead developer Jay Pavlina recognized he would not be able to make any profit on his time spent for that game, thus Super Retro Squad would feature original characters, art, and gameplay inspired by the characters and games from Crossover, and would be a commercial endeavour.
[16] Unlike Crossover, Super Retro Squad was being made by a team of six members hand-picked by Jay.
[17][18] In February 2017, Exploding Rabbit announced that "Super Action Squad" was renamed to "Glitch Strikers", and development on the game resumed since.
Wired's Chris Kohler considered the game a "surprisingly thoughtful 8-bit mashup" and praised Pavlina's efforts for "how these six disparate characters all feel like they were ripped from their own classic NES titles, but fit in perfectly to the Mario levels".
[19] Margaret Lyons from Entertainment Weekly called the combination of characters with the Mario universe "a mindfrak for the ages".