Sorry about that. Yeah I need to improve the pacing. I just don't want to throw too much at the player and I want to get them to adjust before throwing new enemies. There are two other enemies by the way, introduced in Level 4 and 5. But yeah I do need to master the pacing as well as the difficulty curve of the game.
I tried to make it known that you as well as your crewmates were the collectables by putting a popup at the end of each result screen, that you unlocked a new collectible. If I update the game I'll make sure to make that more evident though.