Review my game?

What do you all think about my game “Bridge Defender?”
I’m trying to make it harder by adding a reload time, but tell me your thoughts on it!

BTW I only spent 2 days on it, so don’t expect something special.

Fun, but easily exploitable.

just move to the far right and spam your space bar.

That was why I wanted to add reload time. So you couldn’t spam bullets as easily. I’m also trying to find a way to make the enemies spawn randomly.

Not at random times, but random places.

do it like this=
some trigger => dice/number randomizer => filter

when the randomizer picked a number that triggers the filter, the filter gets triggered [duh]

add separate filters that triggers spawners or something to make them spawn at random places.