How about switching things up a bit and giving him a boomerang style weapon like in Power Blade for NES? It could be a futuristic Ring Weapon that you can upgrade.
TenToes
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I realized I was actually subscibed to your Youtube and you show your Tiled workflow there! I need to watch that video. Though I'm also interested in learning to use this for making maps: https://led.itch.io/tilesetter
The tiles look great, I'm gonna use them for a small Zelda-like demo game :)
For an idea for a "planet" how about this? Sword and Tech. Think Sword and Sorcery but instead of magic there is technology left behind by an advanced ancient civilization, called Relics. Instead of sorcerers there are Scientist, studying ancient tomes called User Manuals, trying to unlock the secrets of the Relics. So it would be mostly not advanced (think Conan the Barbarian) but there would some advanced Relic technology that pops out of the scenery with it's distinct look. Pretty cool, huh? Out hero could be a hunter of Relics and his pal a mad Scientist :)