For a first attempt...
Not bad at all.
I voted 5/5, but im only going to give you 7/10 in the actual review for the following reasons.
#1. At the loading screen with the adverts, the only way to continue the game (except popping it out i assume due to the previous comments), past the adverts is by hitting tab until the 'skip ads' button is selected offscreen.
#2. The final level is insanely difficult. I have tried multiple aproaches to achieve victory. from cavalry rushes to holding off for siege weapons (which it turns out are useless due to resurrecting blue monsters destroying them) to mages wiping out rows at a time.
Its amazing for your first attempt, but it does fall short somewhat by the end.