I liked it fine, but it quickly ran out of content. So far the clicking has a nice rythm to it. The levels are about the right lenght for me, wich I think is important, since repeated clicking is not something you want to require for long stretches. As it currently stands, I have difficulty recognizing the inspirations you listed back into the game. I don't see any of the crew management and ship building I associate with FTL. Similarly, I don't see the truly mass waves and character building from Vampire Survivors, and I don't really see the aiming/dodging and astetics of Binding of Isaac. Only the beginning of Binding's item system.
The game looks like a good starting point, and I hope you can built a lot on top of it.
I wrote down some things I noticed while playing:
The metro map, together with the you are here button gives the impression of parrallel paths, instead of a level select screen you can go back on.
The grener zombies feel unfair, as there is about 50/50 that your curser gets slowed and seemingly disabled, regardless of how you play.
The bomb feels underwhelming, since it being a resource I expect it to be impactful. The timer means you need to predict before hand when you get overwhelmed, and far too ofter the bomb goes off after the zombies have reached your cart.
The focus ability seems rather useless. Maybe it can be powerfull later, once you have many people, but when you start it does functionally nothing. What use is it to direct my one shooter who will maybe shoot every eight times I can click.
At 500 scraps, my human seem not worth it. Especially since the first run I got two humans in a row. My second run now has had roughly six non-humnas in a row, getting me up to 345 scrap, which was not enough to buy in the shop.
Twice now the shop had two instances of heal 3, while I was full health, limiting me to only one usefull item.
I did not expect the bomb arrow to reduce my damage after damage increasing pills. The curser also let's you blow zombies down the screen, forcing you to wait for them to slowly get back to hit them again.
I also don't know what the handbook does.
Some minor graphical things:
During one level the damage numbers after clicking did not match the location I clicked. It looked like the click cordinates and the draw coordinates were stretched from the centre.
Sometimes the countdown timer gets below zero for one frame. This is noticable, since the appearance of the minus sign makes the text jump.
There are some laying issues with the pressent and one of the zombie types, as his head stays on top, but his body moves behind.