Thank you so much for playing and for the feedback! I did put a note right beneath the play area that you should just 'try to clear all the cards and enemies' but you're totally right there's not any objective at all, I didn't give myself enough time on the project :)
A few people have said that about grid-based movement, but.... unless I'm crazy (and all my googling in response to these comments is wrong)-- at least the older Bomberman games totally used grid movement. So I can't say I understand that, but maybe the newer ones don't and that's what people are used to now :)