I am more shocked that you guys made this in one week and for a first game no less, this is incredible and love the concept.
To improve I say the cannon feel empty when shooting, feedback when enemy shoot the cathedral like a simple shake and crumpled when game over and also something feels off like playing two different games in one in a disjointed way- change in control, some input irresponsive, etc.
This is a good game, but it is way too ambitious for a game jam so next time pls have smaller scope.
As for the current game expand it, fix the problems, this is a great foundation.
(Also, Dome keeper in 3D hell yeah!!!!!!)