Jumpai is a creation of Frame-Perfect Studio, you can find it in this website for more information or to get it. As you can see in the image, it may seem like a video game similar to other platforms, a character that jumps through different obstacles similar to Mario, but this one has something that you will like. It is specially developed for those who love to create, having a new level editor that you can design yourself.
It has a new update which adds quite a bit of novelty content to Jumpai, including a cannon that can shoot players and items, a magic carpet platform, many new blocks for crafting levels, new cosmetic items and ornaments, Greek and German language options (among others) now available, etc. Many new features that you have to try in your Linux distro.
It has also been optimized, now Jumpai charges much faster And the times will now be shorter so that you can make the most of playing and not looking at the screen while waiting for your new game. On the other hand, the tools for creating new levels have also been improved. Now those tools have been made easier to use and efforts have been made to improve the user interface, new sounds have been added, etc.
Once you create your own levels you can test them and play with them in multiplayer mode, to be able to play with others online.
For the rest, you will have fun and it will hook you as much as any other platform title. They are video games with very simple graphics, and that remind us of the classics, but they have something that continues to attract a lot of attention from gamers. By the way, you can download it for free, it is a ZIP of about 147MB for Linux, although it is available for other operating systems, you even have a multiplatform Java version.