i ended up jumping all the time because it is to hard to avoid the worms otherwise (played on normal), therefor the jumping sound got annoying really fast. after a few upgrades i managed to kill a worm. i would like that the worms would be more visible or have a better indikator/or longer indikator when and where the worm spawns. and i think they leave to fast back to the underground.
cool that you managed to put some upgradeability in weapon, HP etc. in there
i think really good for under 3hours! well done!