Thanks — and 
Darkeyed
I have not decided the name of my game. I thought of "Save the Wall", but also something like "Frosty New World" or "Frozen Pong" can be a good idea. I will think..
I like the idea of a winter theme. In fact, I actually like the idea of having different themes for graphics: winter, summer, maybe carnival or abstract. But I'm afraid to make the game too confusing. Maybe when I finished the first version I try to do some experiments.
Monetization. I have not idea about which model to use to monetize the game. Actually I did not even know if I will be able to monetize this game. For the moment I am concentrating on learning the use of Construct 2. Complete my first game would be a success for me. Make money? I think it isn't my priority in this project. Maybe for the next.
Before thinking seriously about the dollars I have to figure out how to do these things:
- manage the transition from one level to another
- create a path or a story to increase the longevity of the game
- scores, achievements, leaderboards
- music and sounds
Then, after that, I think I can start thinking about how to monetize.