Played it till I got the last upgrade. It's really engaging thanks to the upgrade mechanic. I like the different enemy types and power ups. I also subscribe to a piercing ammo powerup. Exploding ammo could also be a great power up for a few seconds where a hit affects also nearby lanes, but you can also damage yourself if you hit an arrow right in front of you.
Movement speed is also a thing. I had the feeling sometimes the switching of lanes wasn't as responsive as i would want it to be. Overall it's a really great game though that could be played for hours if there was a bit more variation to it :)