Is 5000 points a good amount? I really like playing it and even if simple the visual was very satisfing. First time I noticed the invisble one I was like wtf? Is this a bug? But no, it plays really well. If you will improved it more, I hope you'll make more levels with more kinds of dragons and maybe, dunno, cannon balls as secondary weapon with cooldown(?).
Check mine aswell if you have time to do so, I would be really glad.