Recent results on shell evolution in light exotic nuclei obtained through several experiments performed at GANIL using the MUST2 particle array will be presented. MUST2 has been built for the optimal study of direct reactions experiments in which light recoiling charged particles are detected. In the first serie of experiments reported here, MUST2 was coupled to the TIARA particle array and EXOGAM detectors for gamma-rays, in order to provide a powerful detection system. The one-nucleon transfer reactions 20O(d,p)(d,t) and 26Ne(d,p)(d,t) could be investigated using this setup. Results on the populated states as well as comparison with calculated spectroscopic factors will be presented. In a second study, the Z=8 shell closure was investigated by means of the two-neutron transfer reaction 14O(p,t) using a set of MUST2 telescopes. A newly observed state at low excitation energy in the unbound 12O points to the Z=8 shell quenching, analogously to the established case at N=8 in the neutron-rich mirror nucleus.