Not sure why no one mentions this, but instead of crafting a rare/legendary with crystals, it's way better to craft the 2 crystal one, equip it, then craft another one, equip it and repeat. Every time you do this, the weapons on the wheel get significantly stronger. Once I reached 999 on my weapons, only then I started to get legendary stuff.
Also want to add that the gold system really needs to be reworked, gold is kind of useless now, maybe an option to buy xp/mini allies that also can be upgraded with gold/different skins for your character/ship/map unlocks, whatever, right now the only use is the shop, and it's all so expensive that you can never really buy anything. A world map with shortcuts to all the different maps would also be great, traveling can take quiet a bit of time. Still a 4/5.
Credits go to someone else, forgot the name; Whenever you buy gear with crystals, you always get something better than what you have currently equipped, so basically if you buy the 2 crystals one, equip it, then buy it again, equip it, rinse and repeat, you get very powerful weapons very quickly. Not sure if the developers had this in mind when they designed it, and I think it definitely needs a nerf, it makes the game way too easy, death animations of bosses almost take longer than the actual fight :P. I suggest an option for increased difficulty levels, like a hard mode that has more hp, or maybe a kamikaze mode added on top of that, in which you can never get hit or you die. I also think more variety in the missions would be nice, but not sure what you could add there. Overall a pretty good game, better than I expected, 4/5.
Such a lame idle game. Thank you devs for keeping up this horrible trend, I really appreciate it... not. (here come the downvotes from the casual "gamers" that like it when a game plays itself for them)