By far the best shooting game, best Wi-FI and best multi-player on the DS up to date.
Every game has its flaws, in this case : The bosses get repetitive and so do the levels. Sometimes you must return to a world you had already completed in the past, with a new weapon. Otherwise, I remember this level in outer space, i got lost and i died about twenty times, but this game gets so addictive. When i really first started getting into it I beat it in 4 days.
I still play Wi-Fi sometimes and with 26 different stages you don't get bored easily ... If you like shooting games or not won't matter, you will love this game, trust me.