I was mid of chapter 4, with all hitting turrets upgrades plus starting bones upgrades, then i lost most of it... This is bad. Especially considering i've put some kreds in it afterall to encourage the game (even if it's free kreds, it's still very very disapointing). Dont expect much from game, just see it as an iddle game that can crash when you expect the least...
I started this game as an idle game. Hard at first, you hit some barrier at around mid of chapter one, you need to farm (log in every day is a good way to do it) and use your spell smartly, especially at he beginning of the stage. My upgrade went first Amount of bones at start and bones per kills, then i started with turrets (small, and mid mostly and a little catapult). Nothing on spells so far. I'm mid chapter 3 and even if it's still hard, it's possible to reach 3 stars at every stage, being smart, and as f2P
This game is on Beta. Meaning Devs implement stuffs regularly and fix issues.
Devs listen very well to the community of players. Rudgutter is here on a regular basis and answers questions and Dawayne/Synapticon are well known to create good games with good follow up.
Is this a game whith wich you have to pay to play : NO !
Is this a game where paying helps a bunch : YES !
Is this a hard game : imho, YES !
Is this normal that you have to pay for a game : YES, as it takes time and money for Devs to do it.
So please, to make things work, be constructive in your comments, be creative in your ideas, and HAVE FUN or Get to another place....
NB : I'm not a Dev