I used to play it a lot before I switched to linux, unfortunately the current version is a little bit buggy on Linux for me to play (runs well on Wine but needs a lot of tweaking to run with Logitech F310 controller) I hope this game will be ported or Wine will improve its compatibility. It's a really nice game, has a great 16 bit feel to its gameplay. I highly recommend. Playing with a keyboard spoils the playability and makes it too difficult. Please developer, Port it to Linux.
Unfortunately it's not native to Linux but runs well under Wine, does not work with XInput controllers but if you have a Logitech F310 you can use use your favorite Linux utility to convert Direct Input to keystrokes and it'll work. (Tested on Ubuntu 16.04 LTS 64 bit and Wine 1.6.2) Trying to use the controller on Xinput makes the game crash.