Many of the player reviews for "Monkey GO Happy" are generally favorable, citing an enjoyable overall experience and engaging level design, as of 2015. Several reviews do mention a mild level of difficulty on certain levels, but players usually feel that this adds to the fun of the game.
The casual gaming site JayIsGames.com features an editorial review for many of the different games in the "Monkey GO Happy" series in its Reviews section. Each rating consists of an overall ranking ranging from one to five, and a short written summary of the reviewer's experience with the game. In the review for the game "Monkey GO Happy Treasure," the reviewer mentions the relatively shorter level length in this version, compared to other versions.
Many of the reviews for the series are available on the individual page for a particular installment on a casual gaming portal or download site, in the case of mobile versions. For example, the free online gaming site AddictingGames.com contains numerous user reviews for the various entries in the series. Each game has it's own page on the site, with the reviews found underneath the game itself. The site doesn't place any restrictions or guidelines on user reviews, choosing to leave it as an open response form for players.