Clicker games are supposed to be long, but that's because you start automating the clicking and you don't need to be in the game the whole time. When you make it so that you need to be in the game clicking all the time to not lose hours of progress it becomes tiresome and boring. I still haven't finished the game but the humans destroying a lot of my expensive ships right as I buy them doesn't really make me want to.
Also, upgrades become too expensive too fast, and managing my ships isn't really fun when it slows me down SOO MUCH.
Everything besides the gameplay is awesome tho, so I wouldn't say it's a bad game overall.