The game is not bad, but I would prefer a level format, not a big fan of endless score grinding with inevitable death. And for these endless games a public scoreboard is necessary.
Best games of this type have levels, different weapons, upgrades, different maps and skins. This was simplistic without that. The base mechanics are good and all the details could have been built upon this base.
Also some simple plot could be added.
Another annoying thing is that while I did have the animated cross hair cursor, the standard windows mouse arrow also remained and ruined the view. This seems a common issue with games based on unity engine. One way how this can be avoided in some of these games is by an options menu where you checkbox whether you want to see the windows mouse. Most of times the first time game is opened the standard mouse cursor is checked off but is still visible and you have to turn it on and then off in checkbox to really turn it off. But this game has no such a menu.
A good thing was fullscreen mode.