yeah, i think having little story cutscenes every few levels or something would help the game's story feel more fleshed out! where you can get to know the other dinos and stuff like that. i'm not sure!
the idea of an 'infinite free play' is interesting, i hadn't thought about that! you can play for a very very long time on some levels already, if you learn to abuse the special powerups that give you more blocks and moves.