Wait, this is about Galak-Z? I had no idea.
I was under the impression it had a really extended development precisely to finish it...
Mechanically, the game is finished through Season 4. You can finish the whole story through that point. You then get a 'Season 5: Coming Soon' label on the main menu. I honestly didn't even know what that meant until I visited the OT. I thought I had to unlock it somehow. No where does it mention this DLC season 5 on the store page or in game. The story is very clearly not wrapped up. The writing is poor anyway, so it's not a reason to go to it, but the game is very clearly incomplete.
The game is also lacking any sort of extra modes like you'd expect from a rogue-lite. They've promised to add some, but there's no Daily Challenge, Time Attack, Challenge Mode, Endless mode, etc. All there is is the base game.
Technically, the game was also a complete mess. Frame rate drops everywhere, weird glitches with spawning enemies in walls, lots of hard crashes (For me, anyway) and other technical mishaps. The problem with hard crashes in that game is that it means you lose all your progress for the whole season, because you can't resume once you start an episode. It's awful and really unacceptable. I lost probably a good 2-3 hours of progress over the course of the game to hard crashes when I was playing near launch.
I love the game and it's really fun to play, but it was no where near ready at launch. I was shocked when I read all the reviews and saw no mentions of these various problems. I wouldn't have bought it at launch if I knew about this. I'm certainly not being any future 17-bit stuff until I read that they're actually finished products.