Thank you very much for your comments and for playing it.
I will think in a way to polish those things you mention.
I was thinking in selecting level: begginger, normal, master, to make things easier or harder, including the life points collect, for me it was so easy, i'm pretty sure because i tested it a lot, but it's very important for me that the frustration does not throw away players.
About the spawning, yes i was thinking in make them spawn from the edges of the map, some of them spawn from downside, some should spawn from top.
I think i will delete the front ornaments to have a cleaner screen and those vicious enemies don't hide.
Thank you for your kind observations.