It seems early in the game if I switch tabs to do something, I'll die. I wonder if this is deliberate in the game. I'm improving the targeting/accuracy at first, to get it out of the way and this game is quite slow at first because I'm not improving the attack speed or how much damage each hit gives. It's frustrating that i'm set back an die on the 3rd round just because I decided to pass the time not watching the ridiculously slow fire hit or miss targets but looking for an old friend on Facebook for a few minutes.
I don't think the dev knows how to be considerate or show basic consideration. Too many scammy devs are focused on making money and not enough on making a game fun enough to want to play it in the first place. Lowlifes spend their money instead of playing the game to get ahead. Lowlifes also make it necessary to spend lots of money to progress meaningfully. Such lowlifes deserve each other.
Why make a game that's so straightforward only to openly display your contempt for players and any respectability left in the craft of gamemaking now dominated by studios who want games to be more like compulsive, daily addictions instead of enjoyable fantasies?
This game should play smoothly and quickly enough and get more exciting with progress, the reward for progressing and getting good. And while the randomness of upgrades should enhance replayability, this game should also be one of choices that make a difference so players can get "better" and not merely be a passive participant subject to the random number generator.
And if you put your game in a browser, it shouldn't fail automatically just because someone switches to another tab while so many cpu cycles are wasted wading through the slow, dull, inaccurate, clumsily done beginning that you've utterly CRIPPLED so first upgrades need to be WASTED on something as pedestrian as ACCURACY.
I hope every single thing on your smartphone, especially games, especially FPS's and RPG's and TD games all start you off by giving you 0% accuracy so you have something to level up to. You'll probably never rise to the level of doing anything apart from what you can get away with doing, much like a reckless wild animal humans have been feeding too long and has now become expectantly aggressive.