Well, thank for all the new comments. All your suggestions and critics have been quite constructive! Time to reply now !
About VVVVVV similiraties :A VVVVV clone already! The game's hasn't been out two months.
As I mentioned in my first post, the game has been finished two years ago but, unfortunately has never been released only. The team was not working on a clone of
VVVVVV at all, it has never been an attempt to do so, really.
About mechanics improvements and your suggestions:[...]when flipping is your only mechanic and a very popular flipping game was just released, you need some way of standing out from the crowd.". We fully agree with his suggestion.
Currently, the team is thinking a lot about new gimmicks such as "hard and soft surfaces" suggested by
Increpare (many thanks to you !). This idea is a very interesting one and I think many things can be carried with different kind of surfaces, e.g.: plates of glass that break after a jump, soft surfaces that will not kill you when you fall on it, rubber grounds that makes you jump faster or longer, etc.
The other kind of gimmicks is about the two different sides (black/white) of the screens. The team has been thinking about different arrangements of this "changing zone". The main idea would have been to have different kind of area in a level (horizontal division instead of vertical, but also different black/white areas in the same level like a checkerboard as Valter put forward :
Maybe add more arrangements for the black/white sides? (Examples including horizontal line instead of vertical, diagonal cross, checkerboard, etc.)
About extra pills : on many levels i ended up with extra pills [...] It makes it feel like the level designers were not aware of the best way to get through the levels. If the extra pills are intentional, it would be cool to award a bonus for unused pills so it doesn't look like a mistake.
Gold tips for sure. As far as I know, level designer was aware of the multi-path possibility and he just wanted to keep it that way. However to include something like a bonus for unused pills is probably the best way to award players who will find the best path to end a level. This suggestion comes along with an improvement of the visual interface such as a display for how many pills are remaining and maybe a score or a timer.
About music/sounds/graphics improvements : A "background" music will be soon added to the game, but for the moment, the team miss an artist to improve the global graphics of the game. It is not a priority for the moment, but it will be strongly considered when the team will be working on a new version of the game.
One more time, I would like to thank you all for your time and your great advices on the game. I'm sure it will help a lot, not only for this game, but also for the next works of the team! Thank you very much guys!