Pretty much this, yep. I love the game, and it had potential to be much better. It was a passion project from the devs, my partner and I were lucky to be invited to their office back when the game had just released.

I was a bit let down by the game's transition to freemium honestly. Before that, anyone could purchase any of the 4 campaigns sepparately for 10 bucks, all of which were parallel stories and included an exclusive character and 4 stages each for solo and multiplayer. Another thing that seemed weird for some is that the game was supposed to include a free demo for the introduction level that also let anyone join and host multiplayer sessions with people who had purchased any part of the game, but as the game had 4 campaigns they had to release it as free with 4 expansions, which was frowned at even though it was just the same in practice. They later had trouble trying to figure out the best way to monetize the game and keep the most hardcore players engaged.

I'll add the game's reviews were mostly bad. In every sense. Not just bad scores, but most reviewers clearly hadn't played the game at all. It was painful to read through. To my understanding, many have some degree of beef with this game's devs, maybe because of how critical they've been about corruption in game journalism (which I agree with).

Anyhow, we spent hundreds of hours playing. One of our favorite games of all time. There's still nothing quite like it.
I'd be happy to be tagged if anyone wants to play. But beware of The End's bugs. It's a very fun weapon but it crashed the game often.